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Orientation domain diversity in macaque area V2

Authors Ramsden BM, Hung CP, Roe AW

Received 14 December 2013

Accepted for publication 13 May 2014

Published 24 September 2014 Volume 2014:6(Thematic series: Organization and function of the visual system in primates) Pages 97—112

DOI https://doi.org/10.2147/EB.S51821

Checked for plagiarism Yes

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Peer reviewer comments 3

Benjamin M Ramsden,1 Chou P Hung,2 Anna Wang Roe3

1Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, USA; 2Department of Neuroscience, Georgetown University Medical Center, Washington, DC, USA; 3Department of Psychology, Vanderbilt University, Nashville, TN, USA


Abstract: Single orientation domains in primary (V1) and second (V2) visual cortical areas are known to encode the orientation of visual contours. However, the visual world contains multiple and complex contour types. How do these domains handle such complexity? Using optical imaging methods, we have examined orientation response to two types of contours: real (luminance-defined) and illusory (inferred). We find that, unlike area V1, there are multiple types of orientation domain in V2. These include "real only" domains, "higher-order" domains (which respond to an orientation whether real or illusory), and other domains with nonmatching real/illusory orientation preference. We suggest that this plurality of orientation domains in V2 enables the complexities of local and global contour extraction.

Keywords: primate, visual cortex, V2, functional organization, functional domains, optical imaging

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